//when clicking subsidiaryServer radio,showing span whose id is serverIP
function showServerIP() {
	var serverIP = document.getElementById("serverIP");
	serverIP.style.display = 'block';
}

//when clicking mainServer radio,closing span whose id is serverIP
function closeServerIP(){
	var serverIP = document.getElementById("serverIP");
	serverIP.style.display = 'none';
}

